US1812161A

US1812161A - Printing mechanism for calculating machines

Info

Publication number: US1812161A
Application number: US122610A
Authority: US
Inventors: Mapel Clarence Orin
Original assignee: PORTABLE ADDING MACHINE COMPAN
Current assignee: PORTABLE ADDING MACHINE Co; PORTABLE ADDING MACHINE COMPAN
Priority date: 1926-07-15
Filing date: 1926-07-15
Publication date: 1931-06-30
Anticipated expiration: 1948-06-30

Description

June 30, 1931. c. o. MAPEL PRINTING MECHANISM FOR CALCULATING MACHINES Filed y 1926 4 Sheets-Sheet l \W 7, WW

mvgmoa CYHIZIZC 011111769065 ATTORNEY June 30, 1931. c. o. MAPEL PRINTING MECHANISM FOR CALCULATING MACHINES Filed July 15. 1926 4 Sheets-Sheet 2 INVENTOR I Chremsflr W 155i ATTORNEY June 30, 1931. c. o. MAPEL PRINTING MECHANISM FOR CALCULATING MACHINES Filed July 15, 1926 4 Sheets-Sheet 3 ATTQRNEY c. o. MAPEL PRINTING MECHANISM FOR CALCULATING MACHINES June 30, 1931.

Filed July l5, 1926 4 Sheets-Sheet 4 A... ATTORNEY INVENTOR Clarenwflrinifqfd Patented June 30, 1931 UNITED STATES PATENT OFFICE CLARENCE CRIN MAIEL, OF CHICAGO, ILLINOIS, ASSIGNOR TO PORTABLE ADDING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS PRINTING MECHANISM FOR CALCULATING MACHINES Application filed July 15, 1926. Serial No. 122,610.

This invention relates to improvements in printing mechanism for calculating Inachines, and has for its objects to provide simple and etlicient means whereby ciphers in an amount; to be listed will be printed. without the necessity of actuating cipher keys in the keyboard of the machine; to provide printing mechanism for adding and listing machines, which, in adding or simple listing operations, will print ciphers only in. the decimal order positions corresponding with decimal order key rows in which no key is depressed located to the right of the key row of highest decimal order in which a key is depressed, except in the case of the two extreme right-hand decimal order positions, in each of which a cipher Will be always printed unless a digit key has been set; and to provide automatic cipher-printing mechanism especially adapted for embodiment in the calculating machine disclosed in the co-pending application of Glenn J. Barrett, Serial No. 50,219, filed August 14, 1925.

In the accompanying drawings, wherein the invention is illustrated in its preferred embodiment,

Figure l is a right-hand side elevation of an adding machine equipped with the improved printing mechanism, certain parts,

@ includi the ribbon mechanism. and outer casing, ing omitted;

H fragmentary lelthand side elevation the machine;

3: detail view, partly in vertical secti on, so ring", the automatic restoring or releasin "icons for "the digit keys and the locki n ps and cipher stops in action;

4 vertical longitudinal sectional the chine, taken in the plane or oi? Fig. 9, the being in norsectional view similar .5 showing the digit key 3 1n the column as from right depressed an d the pans in the l e end of the c handle or act of printing s roke of the op 4. l in the the amoin to Fig. (3 a de perspective View showing Fig. 8- a detail perspective view showing one of the cipher stops and its co-operating locking stop and the shouldered pivot pin for connecting the two stops in disassembled relation; and

Fig. 9 a detail plan view of the series of locking and cipher stops for the type-carrymg sectors. 7

I have shown, and will describe, only so much of the calculating machine as is neces sary'to a full understanding of the operation of the improved printing mechanism. Encept as modified by the present improvements, as hereinafter pointed out, the machine illustrated is constructed as disclosed in the Barrett application referred to above, and substantially as physically embodied in the calculating machine commercially known as the portable.

The working. parts of the machine are mounted in a skeleton main frame 1 preferahly housed in an outer casing 2. The accumulator pinions 3 are loosely journalled. on a shaft 4 extending between two: similar rock arms 5 within framework 1. Rock arms 5., and a third rock arm 6 located outside of "frame 1, are all fixed on a rock shaft 7 journalled in said frame and are con nee at their forward ends by a t rod 8 passing through a slot 9 in the lrame l. The i coking support for the accumulator d vn up nto the position shown a spring 10 connecting such the res one of he ea r 11 which are dly in ii The adding 2-1 of the accui u 1 ton i which there a in the machine shown) normally in the teeth of the ing sectors or os lie oscillating the machine.

and is provn cket connection through slots 18 in the bars. Stud bolts 19 a 17 are -on links 16 pass through the. foremost slots 18 in bars 17 and are normally held engaged against the forward ends of said slots by s rings 20 which connect links 16 and bars 17. Along their upper edges bars 17 are each provided with nine digit stop lugs 21 laterally staggered and arranged from front to,

rear to engage respectively with the lower ends of the reciprocable stems or stop plungers 22 carrying the second to tenth keys,

respectively, from front to rear of the fore-- and-aft-extending column of keys thereabove.

The second to tenth keys in each decimal order row are the digit keys and are provided on their faces with the numerals 1 to 9 respectively, not shown. There is a tenth key in each column of the keyboard forward of the digit keys 23. These front keys 23" are carried on reciprocable plungers or stems 22, and are not provided with numer- Each sector is formed with a projection or shoulder 33 normally engaged by the forward edge of the cross-bar of a swinging restoring bail 34 to hold the sectors and parts connected therewith in the'positions shown in Fig. 4 against the pull of the operating springs 35-. One spring 35 connects each sector 32 with the anchor bar 36 which is fixed in frame 1', and these springs are normally under tension and pass over the grooved hubs 37 of the sectors 32 to anchor pins 38 on the sectors. Each sector 32 carries on its normally rearwardly facing arcuate edge a vertical series of ten numeral types 39, the uppermost type being a cipher type and the other types being the digit types 1 to 9, respectively, from the cipher-type to the lower end of the series. Each adding sector 12 has one type sector 32 arranged alon side the opposite face thereof from that ace with which the associated link 16 is connected, and has also a lost-motion connection with the said type secs tor (comprising headed studs 40 fixed on the type sector and extending through short arcuate slots 41 in the adding sector) aral characters. These keys 23 are preferably/ ranged to permit relative rotation between colored in contrast with the digit keys and as hereinafter set forth, said keys 23 function as column correction keys.

The

key stems

22 and 22 are slidably guided to move endwise in slots in

guide members

24 and 24 supported in the main .1 and extend through slots '29 in key stems 22 and 22' below slots 27, and said bars are notched along their upper edges to form on each bar ten downwardly and rearwardly extendin cam edges 30 normally extending throng slots 29. At the lower end of each cam edge 30 extending through adigit key stem 22, each of the slide bars 28 is cut away forwardly to form locking recesses or notches 31 in which are adapted to engage the portions22 of the di 1t keys located between the adjacent ends 0 slots 27 and 29, for'the (purpose of locking the stem of a depresse digit key down, as shown in Fig. 5,1n position for engagement of its associated digit stop lug 21therewith. No lockin reoess 31 and no stop lug on stop-carryin ars rovided for co-oper'ation wit the stems o the column correction keys 23, and, in this respect, the present construction differs from that shown in the Barrett application and from the commercial machine rested on return movement thereof by stop the accumulator frame and have noses 45 on lugs 42 thereon engaging the rearwar 1y extending arms of the three-arm transfer pawls 43. The pawls 43 are pivoted on a rod 44 in their forwardly extending arms having substantially vertical rear edges engaged by the trip fingers 46 fixed on the adding pinions when the accumulator is clear and having. beveled forward edges over w ich the trip fingers46 ride to trip the transfer pawls to permit the one-ste transfer or carrying movement of the adding sectors. The transfer pawls 43 are held in normal position b springs 47 connecting the pawls with late levers 48 pivoted on a'rod 49 in the accumulator frame, said pawls having laterally extendin lugs 50 on the depending arms thereo normally engaged under the lower edge of levers 48 just forward of locking notches 51 in the lower edges of said levers. When a transfer pawl is tri ped by a finger 46 its lug 50 engages in note 51 in the associated latch lever 48, the free end of which lever swings down onto a stop rod 52 in frame 1 to lock the pawl with its free end above the path of sto lug 42 on the associated adding sector 12. l ripped pawls are re-set r automatically after an adding operation by the downward rocking of the accumulator frame upon the forward stroke of the main operating handle 14 in connection with a succeeding adding operation or in connection with a blank or idle operation prior to taking a total. It will be apparent from a comparison of Figs. 4 and 5 that, if a pawl 43 be tripped while the adding pinions and sectors are in mesh, upon downward rocking of the accumulator frame to the position shown in Fig. 5, lug on the pawl is freed from notch 51 and'will be drawn forward to normal position by spring 47. A stop rod 53 limits swinging movements of the accumulator frame.

- The side arms of bail 34 are loosely journalled on shaft 13 at opposite sides of the two interspersed series of adding sectors 12 and type sectors 32, and the side arm at the left side'of the bail is provided with an extension 34 normally extending downward from shaft 18 opposite the normally depending arm of a Y-shaped rocker plate 54. Rocker plate 54 is loosely journalled on shaft 13 and its normally depending arm is rigidly connected with bail arm extension 34*- by a short transverse rod 55. A fore-and-aft-extending link 56 (Fig. 2) is pivotally connected at its rear end to the left-hand end of rod and is pivotally connected at its forward end at 58 to the forward end of a rock arm 59. Rock arm 59 is pivoted at 60 on frame 1 at the outer side of said frame to rock up and down, and said rock arm carries a contact roller 51 its forward end adapted to work in a cam slot in an oscillating cam plate 62 fixed on the left-hand end of shaft 13 outside frame 1 to oscillate with said shaft. The cam plate 62 has a high dwell portion 62 at one end of the slot therein, and a low dwell portion 62 at the opposite end of said slot, connected by an intermediate active portion 62 arranged to force roller 61 and the forward end of arm 59 upward and rearward during the intermediate portion of the forward stroke of handle 14 and cause downward and forward movement of said arm and roller under pull of the heavy bail-restoring spring 63 and the main handlerestoring spring 64 during the intermediate portion of the return motion of the handle, said arm and roller and the connected bail remaining stationary during the remaining or end portions of each handle stroke. Sapring 63 is connected rod 55 and me rod 65, and spring is anchored at i forward end to frame 1 and connected at rear by a cord 66 over pulley 67 journalled 57 r cam plate 52.

y 58 carried hy arm 59 war as in a slot in name 1. The transverse bar of bail 34 worlrs curved slots 12 in the adding sectors 12, and the rearmost of the two upper arms of rocker 54 is adapted to engage one of the frame rods 11 (as shown in Fig. to limit rearward movement of the bail bar. The other arm of plate 54 carries a stud 69 which co-operates with the depend: ing arm 70 of a pivotally mounted locking bail 70 on frame 1 to normally hold the transverse bar of said bail out of locking notches 71 in the key-stem locking slide bars 28, and to permit said bail bar to drop by gravity into said nOtches (as shown in Fig.5) to prevent manipulation of keys of the keyboard after the operator starts actuation of handle 14.

The accumulator frame 5, 6, 8 is adapted to be rocked downward in adding operations by a cam 72 fixed on shaft 13 between handle 14 and the right-hand side of frame 1. Cam 72 has an active cam edge portion 7 2 normally extending to a point forward of and above a contact roller 7 3 journalled on the upper end of a pivoted control device 74. Device 74 is journalled at 75 on rock arm 6 of the accumulator frame forward of rock shaft 7 and its upper portion is normally rocked rearward against a stop pin 76 on arm 6 by a spring 77 connecting pin 76 with a pin 78 on the upper portion of said device. Cam 72 has a holding or high edge portion 72 concentric with shaft 13, extending up around the shaft from the forward end of the active cam edge portion 72 Cam 72 is designed to depress the accumulator frame during the initial part of the forward stroke of handle 14 to carry the accumu lator pinions 3 out of mesh with adding racks 12 before bail 34 begins to swing rearward. The accumulator frame is held demeshed until handle 14 is released and begins its rearward. stroke, whereupon the frictional dragof holding edge 72 of the cam or roller 73 (preferably augmented by a notch 7 2 in said cam edge which passes slightly to the rear of the roller at the end of the forward handle stroke) swings device 74 on its pivot against the light spring 77 until roller 73 passes over the pivot center of the deviceyand the accumulator frame is then drawn up by spring 10 to carry the pinions 3 into mesh with the racks 1.2 before bail 34 begins its return or forward adding-rack-restoring movement. The pinions will normally remain in mesh until another adding operation of handle 14 is made. t e device 74 automatically being re stored iormal. position by its spring upon return 0:. cam 72 to normal position.

The platen 79 mounted. on a platen shaft 80 jotinalled in a rocking platen frame 81 fixed on rock shaft 82 journalled The platen is adapted to be rocked from the position shown fuli lines in Figs. 1

' inting position (shown in and in full lines in Fig. 5) by means of link 83 pivoted to cam 72 at 84 and carrying a stud 85 at its rear end interlocked in notch 86 in a rocker plate 87 fixed on rock shaft t will be observed 4 and 5 that the uppermost types Ipes) on the type-carrying sector-s umns.

said application and machine hereinbefore referred to,

Except as hereinbefore pointed out, the several parts above described are constructed and arranged substantially as disclosed in the application and machine before mentioned; In said machine and application, the adding sector stop bars 17 carried cipher stop lugs at their forward ends arranged so that the stems of the front transverse row of keys corre sponding with keys 23 would, when depressed, move down directly in front of said stops and prevent any movement of said bars. Locking notches 31 were provided for these key stems and it was necessary to depress one of these keys in each column in which it was desired to print a cipher. A single series of stops was provided normally arranged to stand in front of stop fingers 88 on the type sectors 32 and hold each of said sectors with the cipher. type thereon below the printing line during adding operations of handle 14, except when either a digit key or a cipher ke of said machine in the corresponding co umn of the keyboard was depressed. I have providedmeans whereby desired ciphers are automatically printed without printing undesired ciphers to the left of the highest decimal order of the number being printed. I have, in' the preferred'construction shown, provided means whereby ciphers will be always printed inthe two right-hand col- .umns unless a digit key is set in these col- The novel provisions for effecting automatic cipher printing will be now de scribed.

A series of cipherrinting-position deter-- minin stops A, B, CED, E, F and G are arrange for co-operation with the stop fingers 88 on the type-carrying sectors 32. These cipher-t pe printing-position-determining sto s eac comprise a lever. of substantially bel -crank form in side elevation, loosely pivoted on a transverse frame rod 90. The for ward arms of the stop levers extend upward alongside the rear portions of the adjacent key-stem-locking slide bars 28 and said arms are provided, respectivel with laterally bent lugs A, ,B, C, D, E, F and G pressed against the rear end edges of the slide bars 28 by double-acting coiled springs 91.- a The springs 91 are connected at their forward ends to bars 28 and extend rearwardly over rod 90 and are anchored to laterally bent lugs 92 on the upper edges of the rear arms of the cipher-type printing-position-determining stop levers, and by their contractile action normally-tend to move each inter-engaged slide bar and stop lever to the position shown in Figs. 1, 2, 4 and 6 and maintain the same in such position. The rearwardly extending arms of these stop levers are provided with laterall bent stop lugs A, B C D E, F and G respectivel arranged in the aths of movement of t e respective stop ngers 88 on printing sectors 32. These stop lugs are aligned transversely of the machine at such a distance forward of the normal positions of stop fingers 88 as to be engaged by said fingers to stop rotation s of sectors 32 when the cipher types on the sectors have advanced to the printing line.

As the series of sectors'32 is not as wide as the series of slide bars 28, I have provided the necessary contraction by making two stop levers at each end of the series of broad skeleton form, as shown, so that they have double bearings on rod 90'with their rear arms comprising two laterally off-set portions connected by transverse webs so disposed as to not interfere with independent pivotal movements of adjacent stop levers or pivotal movements of adjacent locking stops for the printing I sectors. The sto levers are suitably spaced on rod 90, as y double hubs H .on leve-rs C and E, a single hub H on lever D, and four. loose spacing sleeves S on rod 90, as shown. l

. The series of type-sector locking stops comprises pawls or dogs 0, d, e, f and 9 arranged alongside of the rear stop-lug-carrying arms of stop levers C, D, E, F and G, respectively. These locking dogs are pivot-ally held at their forward ends to said lever arms by pivot studs 93, the reduced ends of the shanks of which are passed through small holes 94 in said lever arms and peened over. The stop levers and dogs are preferably formed of 1 are preferabl slightly off-set laterally from the adjacent aces of the lever armsto which they are pivoted to reduce the frictional contact, and small spacing bosses or studs 123 are punched up from the off-setportions of the dogs and engage the lever arm faces near the forward ends of the arms.

The stop lug on each of the lever arms passes through a notch 95 in the lower edge of the dog which is pivoted on'that lever arm, and normally engages the top wall of said notch to support the dog adjacent its forward end in such position that a laterally bent sectorlocking lug on the end of the dog is maintained directlyin front of the stop finger 88 on the associated type sector 32 to prevent any appreciable advance of the stop-fin er toward the cipher-type printing-position-determining stop lug on the lever arm to which ally toward the left to a point overhanging the upper edge of the next dog to the left thereof. In the construction shown these lifting lugs 0 (Z 6 f and g are so arranged that the left-hand end of each lug normally rests on top of the right-hand end of the next lifting lug to the left thereof. These locking lugs are returned to and held in normal position by gravity action.

Adding and listing operation In Figs. 5 and 7 the parts are shown in position for printing 300.00 on the paper web in connection with an operation of the machine for accumulating this amount in the accumulator, and a description of this adding and listing operation will make clear the mode of action of the novel printing mechanism in adding and listing operations, as well as in simple listing operations Where the number is listed without an action of the accumulator. To add and list this amount the operator simply presses down the digit key in the fifth column from the right of the keyboard bearing the indication 3 (which, inthe machine shown, is the fourth key from the forward end of the column), removes his finger from the key and draws forward handle 14 to the forward limit of its throw and then releases the handle for its return by spring 64. Depression of the digit key cams the associated locking slide bar 28 endwise forward against the pull of spring 91 until the web 22 of the key stem 22 is opposite locking recess 31, whereupon the bar will snap rearward a slight distance toward its normal position, to the position shown in Figs. 5 and 7, to lock the digit key and its stem 22 in depressed position with the lower end of the key stem in the path of the third stop lug 21 from the front end of the fifth adding-sector movement-controlling slide bar 17 from the right. Movement of the keylocking slide bar 28 to locking position causes rocking of its associated stop lever E about its pivot, due to pull of the connecting spring 91, sufficient to carry the cipher-type printing-position-determining lug E above the path of advance of stop finger 88 on the fifth sector 32 from the right of the machine. The upward movement of lug E causes type-sector-locking dog 6 to move bodily in unison with lever E to carry locking lug e on said dog also above the patch of advance of finger 88. The movement of dog 6 up to idle position lifts all the dogs to the fight thereof to idle position by swinging said dogs about their pivots 93 through the action of the overlapped lifting lugs 0 d 0 without rocking an of the stop levers located at either side of lever E and without swinging the dogs f and 9 about their pivots 93.

When handle 14 is drawn forward bail 34 swings toward the rear from the position shown in Fig. 4 to the position shown in Fig. 5 so that the adding sectors are free to turn in a counter-clockwise direction for a full excursion except as restrained by a locking stop or cipher-type printing-position-determining stop or a set digit key stem 22. In the example shown, the two left-hand typesectors will be held against rotation by their connected advancing springs 35, by the locking stops f and g on locking dogs f and g, with their cipher types below the printing line. Since these two type sectors cant rotate it will be obvious that the two adding sectors connected therewith will reman in normal position, as shown in Figs. 5 and 7. The next type sector to the right will first advance until studs 40 thereon move to the opposite ends of slots 41 from the position shown in Fig. 4. Each sector 32 is connected with its associated adding sector 12 by a spring 96, and the two associated sectors are normally held in the relative positions shown in Figs. 4 and 6, with their connecting spring under tension, by engagement of bail 34 with shoulder 33 on the type sector 32 and engagement of stop lug 42 on adding sector 12 with the rearwardly extending stop arm of that transfer lever 43 which is arranged for tripping in carrying operations by that trip finger 46 which rotates with the adding pinion 3 of the next lower decimal order.

The above-described preliminary advance of the third type sector from the left (during which studs 40 move to theopposite ends of slots 41 in the associated adding sector) is sufficient to advance the cipher type on this type sector to the printing line while the adding sector remains stationary and spring 96 contracts. After the lost motion is taken up this type sector will drive the connected. I

make the same preliminary cipher-type po-.

sitioning movement but will be arrested when their studs 40 reach the opposite ends of slots 41 in their connected addin sectors (as shown in Fig. 7), by reason 0" the en gagement of fingers 88 with the cipher-type prlnting-position-determining stop lugs A B C and l) on stop levers A, B, C and D, and there will be no movement of the adding sectors connected with these four right-hand printing sectors. I

As hereinbefore described, the pinions 3 are carried down out of mesh with adding sectors 12 by the action of cam 72 before any movement of sectors 12 can take place, and are held out of mesh until the handle 14 is released and begins its return stroke. The platen 79 is forced forward by cam 72 and link 83 and is pressed thereby against those types which are advanced to the printing line (in the example shown, the types 300.00)

at the end of the forward stroke of handle 14.

and it will be remembered that bail 34 completes its full excursion before the handle 14 reaches the forward limit ofits stroke, so that the impression takes place after the movement of the sectors is'completed' When handle 14 is released it is returned to normal position and bail 34 also is moved back to normal position by the means before described. During the return stroke-of the handle the platen returnsto normal position and the amount set up onthe keyboard is carried into the accumulator. Through the connections before described, the pinions 3 are carired up into mesh with the racks during the first part of the return movement of the handle before bail 34 begins its return movement. Bail ,34 then moves forward,

picking up the shoulders 33 of any type secby engagement of its lug 42 with the associated transfer lever, thusrotating the associated pinion three tooth spaces from its previous position in counter-clockwise .di-

rection'to efl'ect adding.- The bail then also picksup the shoulders 33 of the four right-- hand type sectors and moves all five ofthe right-hand type sectors relatively to their connected adding sectors until studs 40' travel from those ends of slots 41 at which they are sh own in Figs. 5 and 7 to the opposite ends of the slots, re-tensioning the springs The lost-motion connection 4041 and spring connection 96 between each printing sector and its connected adding sector are utilized to provide for a one tooth-space return motion of the adding rack beyond normal position when the transfer lever 43 cooperating with its stop lug 42 is tripped by the transfer trip finger 46 of the next lower frame 97 normally engaging under a stop pin 99 on frame 1 to determine the normal position of slides 28 and the locking stops and cipher-type printing position determining stops which co-operate with the fingers 88 on type sectors 32. A stop and digit key restor ng bail 100 is pivoted on a rod 101 carried by the side arms of frame 97 and its cross-bar extends behind a. rearwardly facing shoulder 97 on the right-hand side arm of frame 97 and the rearwardly facing cam edge 105 of a bell-crank key lever 106 and is normally held against said shoulder and cam edge by a spring 102 which is anchored to the crossbars of frame 97 and bail 100. One side arm of bail 100 depends below its pivot and carries a contact pin 103. A trip roller 104 ournalled on cam 72 rides under pin 103 and imparts an idle rockin movement to bail return stroke of handle 14, said roller rocks bail 100 and, through said bail, rocks frame 97 as shown in Fig. 3, thereby forcing locking bars 28 forward to carry the lockin notches 31 forward of webs'22 of the digit Eey stems so that any depressed digit keys will be snapped up to normal position by their return springs 25. This tilting movement of: frame 97 also temporarily carries all the locking stops and cipher-type printing-positiondetermining stops up out of the path of fingers 88 on sectors 32 being returned by bail 34. After roller 104 passes to the rear of pin 103, the slides, frame, bail and two series of stops assume normal position.

he bell-crank key lever 106 carries a combined repeat and errorkey 107 on its upstand ing forward arm and is pivoted on a stud 108 carried by the left-hand side arm of pivoted frame 97. Key lever 106 is normally frictionally held by a suitable friction device, not shown, with the front edge of its keycarrying arm abutting the rear edge of a stop lug 109 on the left-hand side arm of Jun normal position prior to operating handle 14, cam edge 105 of key lever 106 will rock bail 100 against the pull of spring 102 to lift con tact pin 103 on said bail out of the path of trip roller 104 on cam 72 so that depressed digit keys and any type-sector-locking stops and cipher-type printing-position-determining stops lifted by the depressed digit keys will not be restored on return of handle 14 and the number set up in the keyboard may be repeatedly added into the accumulator by successive operations of the handle 14 until key lever 106 is restored manually to normal position. The edge 105 of key lever 106 is provided with a locking notch .110 adapted to receive the edge of bail 100 to prevent accidental return of the key lever from repeat position to normal position.

Any digit key 23 erroneously depressed in a particular column may be re-set by depressing of the proper digit key in said column, or if no digit key should have been depressed in that column said erroneously depressed digit key 23 may be restored by depressing and releasing the column correction key 23 at the forward end of that column of the keyboard. It will be recalled that no locking notches 31 are provided for the stems 22 of correction keys 23 so that said keys 23 will rise as soon as released, and the locking slide bar 28 cammed forward by depressing a key 23 will return rearward to-its normal position and restore to normal position the cipher-type printing-position-determining stop and the type sector locking stop associated with said slide bar.

The means employed for preventing adding of a number set up in the keyboard upon actuation of handle 14, and the means employed for taking totals, indicated in the drawings, are the same as those disclosed in the co-pending application and machine heretofore referred to, said means being controlled by the non-add key 111 and total key 112, and including the cam plate 113 pivoted at 114 on frame 1 and normally held in the position shown in Fig. 1 by spring 115. The operation of the printing mechanism innonadd operations is exactly the same as in adding and listing operations. I

In taking totals, the depression of the total key 112 not only causes the adding pinions 3 to be meshed with adding sectors 12 during the forward stroke of handle 14 so as to cause driving of any advanced pinions in reverse direction (clockwise direction as viewed in Fig. 4) to their zero positions in which fingers 46 abut against the straight faces of noses 45 of the transfer levers 43 to stop the counterclockwise rotation of sectors 12 and 32 with the proper type at the printing line, but also rocks frame 97 to the position shown in Fig.

' 3, by the action of cam edge 116 of cam plate 113 on a stud 117 on frame 97. This rocking of frame 97 lifts all the locking stops and all the cipher-type printing-position-determining stops up above the path of type-sector fingers 88 so that, when handle 14 is drawn forward with total key 112 depressed, all the type sectors first advance to carry their cipher type to the printing line and take up the lost motion in connections 4041 with the adding sectors, and then any adding sectors whose meshed pinions are advanced from zero position will rotate one or'more toothspaces in reverse direction from adding direction until their pinions reach zero, and the type sectors associated with said'adding sectors will advance from cipher-printing position with said sectors a corresponding number of type spaces, thereby setting up on the type sectors the amount which had been accumulated in the accumulator, and printing the same when the platen moves forward against the type at the end of the forward stroke of the handle. Cam 113 is actuated from total-key'lever 118 by reason of engagement of a stud 119 on said cam in a slot 120 in the key lever 118, the key lever being pivoted at 121 on frame 1.

It will be observed that no locking stops are mounted on the stop levers A and B, so that a cipher will be always printed in each of these columns unless a digit key is set in the key column associated therewith. This is desirable as it permits printing of a lefthand cipher in the tens or dime column in listing amounts less than 10 cents. It will be obvious, however, that the system of locking stops may be extended to include the two right-hand columns, by pivoting locking stops similar to step c on stops levers A and B.

The third sector 32 from the right of the machine is preferably provided with period or decimal point types 39 alongside the numeral types 0? to 9, inclusive, thereon.

The throw of the main operating handle 14 is limited by engagement of a stud 124 on frame 1 with the opposite ends of an arcuate slot 125 in the cam 72.

What I claim is:

1. A zero printing control device comprising a movable cipher stop; a locking stop pivoted thereon; means operatively and directly connecting the locking stop with the cipher stop to cause the former to move in unison with the latter to inactive position; and means carried 'by a locking stop of higher decimal orderrto movev the said locking stop of lower decimal order to inactive position without moving the associated cipher stop.

2. A zero printing control device comprising a cipher stop mounted on a horizontal pivot; a locking stop pivoted to the cipher stop on a horizontal pivot; means operatively and positively connecting the locking stop with the cipher stop to cause the locking stop to move upwardly in unison with the cipher the locking stop and adapted to be loosely engaged by a locking stop associated with a cipher stop of the next higher decimal order to move the said locking stop of lower decimal order to inactive position without moving the associated lower order cipher stop.

3. A zero printing control device comprisinga cipher stop pivoted on a horizontal axis; a locking stop pivoted at one end to 10 thecipher stop on a horizontal axis to swing independently thereof to and from active position and normally seatin by gravity on the cipher stop so as to swinglmdily with the ci- 1 pher stop when the latter is moved to inactive position; and means whereby the locking stop is adapted when moved to inactive position to move a locking stop associated with a next lower denominational order type carrier to inactiveposition.

4. A zero printing control device comprising a cipher stop pivotally mounted on a horizontal axis and formed with an arm for cooperation with a stop lug on a type carrier; a freely swinging type carrier locking stop pivotally mounted at its forward end on the cipher stop, its rear end engaging the cipher stop and projecting beyond it into the path of the type carrier lug; and a laterally ex tending lug carried by the locking stop and overlying a locking stop of the next higher decimal-order, whereby a cipher stop and its pivotally connected locking sto will move together to inactive position an the locking stop may be independently moved to inactive position by said locking stop of the next higher decimal order. I In testimony whereof I hereunto aflix my signature. CLARENCE ORIN MAPEL.